\twocolitem{\_\_WXGTK12\_\_}{GTK 1.2 or higher}
\twocolitem{\_\_WXGTK20\_\_}{GTK 2.0 or higher}
\twocolitem{\_\_WXMOTIF\_\_}{Motif}
-\twocolitem{\_\_WXMAC\_\_}{MacOS}
+\twocolitem{\_\_WXMAC\_\_}{Mac OS whether Classic (Mac OS 8/9 TARGET\_CARBON == 0) or Carbon (including Mac OS X TARGET\_CARBON == 1)}
\twocolitem{\_\_WXMGL\_\_}{SciTech Soft MGL (\_\_WXUNIVERSAL\_\_ will be also
defined)}
\twocolitem{\_\_WXMSW\_\_}{Any Windows}
\twocolitem{\_\_AIX\_\_}{AIX}
\twocolitem{\_\_BSD\_\_}{Any *BSD system}
\twocolitem{\_\_CYGWIN\_\_}{Cygwin: Unix on Win32}
-\twocolitem{\_\_DARWIN\_\_}{Mac OS X}
+\twocolitem{\_\_DARWIN\_\_}{Mac OS X using the BSD Unix C library (as opposed to using the Metrowerks MSL C/C++ library)}
\twocolitem{\_\_DATA\_GENERAL\_\_}{DG-UX}
\twocolitem{\_\_DOS\_GENERAL\_\_}{DOS (used with wxMGL only)}
\twocolitem{\_\_FREEBSD\_\_}{FreeBSD}
\twocolitem{\_\_HPUX\_\_}{HP-UX (Unix)}
\twocolitem{\_\_LINUX\_\_}{Linux}
+\twocolitem{\_\_MACH\_\_}{Mach-O Architecture (Mac OS X only builds)}
\twocolitem{\_\_OSF\_\_}{OSF/1}
\twocolitem{\_\_SGI\_\_}{IRIX}
\twocolitem{\_\_SOLARIS\_\_}{Solaris}
\subsection{Compilers}
\begin{twocollist}\itemsep=0pt
-\twocolitem{\_\_BORLANDC\_\_}{Borland C++}
+\twocolitem{\_\_BORLANDC\_\_}{Borland C++. The value of the macro corresponds
+to the compiler version: $500$ is $5.0$.}
\twocolitem{\_\_DJGPP\_\_}{DJGPP}
-\twocolitem{\_\_GNUG\_\_}{Gnu C++ on any platform}
-\twocolitem{\_\_GNUWIN32\_\_}{Gnu-Win32 compiler}
+\twocolitem{\_\_GNUG\_\_}{Gnu C++ on any platform, see also
+\helpref{wxCHECK\_GCC\_VERSION}{wxcheckgccversion}}
+\twocolitem{\_\_GNUWIN32\_\_}{Gnu-Win32 compiler, see also
+\helpref{wxCHECK\_W32API\_VERSION}{wxcheckw32apiversion}}
\twocolitem{\_\_MWERKS\_\_}{CodeWarrior MetroWerks compiler}
\twocolitem{\_\_SUNCC\_\_}{Sun CC}
\twocolitem{\_\_SYMANTECC\_\_}{Symantec C++}
\twocolitem{\_\_VISAGECPP\_\_}{IBM Visual Age (OS/2)}
-\twocolitem{\_\_VISUALC\_\_}{Microsoft Visual C++}
+\twocolitem{\_\_VISUALC\_\_}{Microsoft Visual C++. The value of this macro
+corresponds to the compiler version: $1020$ for $4.2$ (the first supported
+version), $1100$ for $5.0$, $1200$ for $6.0$ and so on}
\twocolitem{\_\_XLC\_\_}{AIX compiler}
-\twocolitem{\_\_WATCOMC\_\_}{Watcom C++}
+\twocolitem{\_\_WATCOMC\_\_}{Watcom C++. The value of this macro corresponds to
+the compiler version, $1100$ is $11.0$ and $1200$ is OpenWatcom.}
\end{twocollist}
\subsection{Miscellaneous}